/***

    Olive - Non-Linear Video Editor
    Copyright (C) 2019  Olive Team

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "volumeeffect.h"

#include <QGridLayout>
#include <QLabel>
#include <QtMath>
#include <stdint.h>

#include "ui/labelslider.h"
#include "ui/collapsiblewidget.h"

VolumeEffect::VolumeEffect(Clip* c, const EffectMeta *em) : Effect(c, em) {
  EffectRow* volume_row = new EffectRow(this, tr("Volume"));
  volume_val = new DoubleField(volume_row, "volume");

  // set defaults
  volume_val->SetDefault(1);
  volume_val->SetDisplayType(LabelSlider::Decibel);
}

void VolumeEffect::process_audio(double timecode_start, double timecode_end, quint8* samples, int nb_bytes, int) {
  double interval = (timecode_end-timecode_start)/nb_bytes;
  for (int i=0;i<nb_bytes;i+=4) {
    double vol_val = volume_val->GetDoubleAt(timecode_start+(interval*i));

    qint32 right_samp = qint16(((samples[i+3] & 0xFF) << 8) | (samples[i+2] & 0xFF));
    qint32 left_samp = qint16(((samples[i+1] & 0xFF) << 8) | (samples[i] & 0xFF));

    left_samp *= vol_val;
    right_samp *= vol_val;

    if (left_samp > INT16_MAX) {
      left_samp = INT16_MAX;
    } else if (left_samp < INT16_MIN) {
      left_samp = INT16_MIN;
    }

    if (right_samp > INT16_MAX) {
      right_samp = INT16_MAX;
    } else if (right_samp < INT16_MIN) {
      right_samp = INT16_MIN;
    }

    samples[i+3] = (quint8) (right_samp >> 8);
    samples[i+2] = (quint8) right_samp;
    samples[i+1] = (quint8) (left_samp >> 8);
    samples[i] = (quint8) left_samp;
  }
}
